JPH1197911A - Concentrated constant type non-reciprocal circuit element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the high attenuation of higher harmonics with a simple structure by grounding one edge of each central conductor, connecting a matching capacitor whose one edge is grounded to the other edge of each central conductor, and connecting an inductor in series to the other edge of the central conductor at an input side or an output side. SOLUTION: In a central conductor part 16, three central conductors 18 are inserted so that a magnetic body 17 consisting of garnet can be wrapped. The edge part of each central conductor 18 is connected to a capacitor 14, and an electrode on the lower face of the capacitor 14 is grounded. One central conductor 18a is connected to the capacitor 14, and connected to a resistance 15. Also, another central conductor 18b is connected to the capacitor 14, and simultaneously connected to an outside connection terminal. The other central conductor 18c is connected to the capacitor 14, and connected with an inductor 19. The inductor 19 is constituted of a flexible board, and inserted between a central conductive part 16 and a permanent magnet 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumped-constant type nonreciprocal circuit device such as a circulator and an isolator used for microwave communication equipment such as a cellular phone, and more particularly to a harmonic of a second harmonic and a third harmonic. And a lumped constant type non-reciprocal circuit device capable of suppressing the above.

[0002]

2. Description of the Related Art Conventionally, lumped-constant type non-reciprocal circuit devices such as circulators and isolators have a characteristic of transmitting power only in a specific direction and not transmitting power in a reverse direction, and are used in microwave communication equipment. . This lumped-constant type nonreciprocal circuit element has permanent magnets in which three central conductors superposed at 120 ° intervals are arranged on a magnetic body in an insulated state and a DC magnetic field is applied to the magnetic body. Is housed in a case serving as a magnetic yoke.

FIG. 8 is an exploded perspective view of a conventional lumped constant type non-reciprocal circuit device. This conventional example is a lumped-constant isolator, in which three center conductors 8 are provided between a magnetic material composed of a disc-shaped garnet 7 between an upper case 1 and a lower case 2.
Are overlapped in an insulated state, and the center conductor is disposed in the through hole of the ceramic substrate 3 and disposed on the lower case 2 together with the ceramic substrate 3. At this time, one end of each center conductor 8 is grounded to the lower case. The other end of each center conductor 8 is connected to the capacitance forming electrode 4 formed on the ceramic substrate 3. One capacitance forming electrode 4 is
It is connected to the ground electrode 6 via the dummy resistor 5 and terminated. Further, a permanent magnet 9 for applying a DC magnetic field to the magnetic material.
Are arranged in the upper case 1 and the upper case 1 and the lower case 2
Are combined to form a lumped-constant isolator.

The upper case 1 and the lower case 2 are magnetic materials, function as magnetic yokes, and constitute a magnetic circuit that applies the magnetic force of a permanent magnet to the magnetic material made of the garnet 7. One end of each of the two center conductors 8 is extended and protruded, and is used as an input / output terminal. The center conductor is composed of three center conductors protruding from a circular plate-like body, a magnetic body is disposed on the plate-like body, and the center conductor is folded so as to enclose the magnetic body, and is overlapped and configured. ing.

When this lumped constant type non-reciprocal circuit device is used in a microwave communication device such as a mobile phone,
In many cases, a low-pass filter or the like that suppresses harmonic components is used by being connected to the input terminal side or the output terminal side. This low-pass filter is often configured on a substrate on which a lumped-constant type nonreciprocal circuit element is mounted.

[0006]

For example, portable telephones have become extremely popular in recent years, and their miniaturization has been rapidly progressing. In addition, the lumped constant type non-reciprocal circuit device used in the mobile phone is required to be downsized. Also,
Not only miniaturization but also low cost is required.

According to the present invention, a function of attenuating harmonic components is added to a lumped-constant type nonreciprocal circuit device, and a low-pass filter connected outside the lumped-constant type nonreciprocal circuit device is eliminated, thereby achieving overall miniaturization. It is an object of the present invention to provide a lumped constant type non-reciprocal circuit device capable of obtaining a high attenuation of harmonics with an extremely simple structure. It is.

[0008]

According to the present invention, there are provided a plurality of center conductors which are insulated from each other and are superposed at a predetermined angle, a magnetic body arranged closely to the center conductor, and a DC magnetic field is applied to the magnetic body. In the lumped-constant type nonreciprocal circuit device having a permanent magnet as a basic structure and housed in a magnetic yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. In addition, an inductor is connected in series to the other end of the center conductor on the input side or the output side, and the inductor is disposed on the main surface of the magnetic body and wound in a direction parallel to the main surface. It is a lumped constant type non-reciprocal circuit device characterized by being a coil.

Further, the present invention has a basic structure comprising a plurality of central conductors which are insulated from each other and are stacked at a predetermined angle, a magnetic body arranged in close contact with the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped constant type nonreciprocal circuit device configured to be housed in the magnetic yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. Alternatively, there is provided a lumped-constant type nonreciprocal circuit device characterized in that an inductor formed on a flexible substrate is connected in series to the other end of the center conductor on the output side to obtain high attenuation of harmonics.

Further, according to the present invention, as the inductor,
It uses a coil of about one turn formed on a flexible substrate.

Further, in the present invention, a second matching capacitor having one end grounded is connected to the input or output terminal side of the inductor.

Further, the present invention has a basic structure comprising a plurality of central conductors which are insulated from each other and are superposed at a predetermined angle, a magnetic body arranged closely to the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped constant type nonreciprocal circuit device configured to be housed in the magnetic yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. Alternatively, a lumped-constant type nonreciprocal circuit device characterized in that a chip inductor is connected in series to the other end of the center conductor on the output side to obtain high attenuation of harmonics.

According to the present invention, a second matching capacitor having one end grounded is connected to the input or output terminal side of the chip inductor.

Further, the present invention has a basic structure comprising a plurality of central conductors which are superposed at a predetermined angle in an insulated state, a magnetic body arranged closely to the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped constant type nonreciprocal circuit device configured to be housed in the magnetic yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. Alternatively, a lumped-constant type nonreciprocal circuit device in which an inductor of about one turn is connected in series with the other end of the center conductor on the output side to obtain high attenuation of harmonics.

Further, the present invention has a basic structure comprising a plurality of central conductors which are insulated from each other and are superposed at a predetermined angle, a magnetic body arranged closely to the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped constant type nonreciprocal circuit device configured to be housed in the magnetic yoke, each of the center conductors is connected to a first matching capacitor having one end grounded and the other end grounded, Furthermore, an inductor can be connected in series to the other end of the center conductor on the input side or the output side, and a second matching capacitor having the other end grounded can be connected to the inductor to obtain high attenuation of harmonics. Is a lumped constant type non-reciprocal circuit device.

In the present invention, a low-pass filter is constituted by the first matching capacitor, the inductor and the second matching capacitor.

In the present invention, the first matching capacitor has both functions of a lumped-constant type nonreciprocal circuit capacitor and a low-pass filter capacitor.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the miniaturization of not only a lumped-constant type non-reciprocal circuit device but also a low-pass filter connected to the input side or the output side has been studied. Then, in a lumped-constant type nonreciprocal circuit element housed in a magnetic yoke and packaged, an inductor is connected in series to an end of a center conductor on an input side or an output side to reduce high attenuation of harmonics. It is possible to obtain.

The inductor connected in series to the end of the input-side or output-side center conductor can be, for example, a coil of about one turn, and can be configured very simply. This one
As the turn inductor, for example, a one-turn coil can be formed on a flexible substrate and used. This inductor may be a chip inductor,
You may comprise using a copper wire. The inductor is arranged in a magnetic yoke and is configured in one package. Of course, this inductor is not limited to one turn.

As the inductor, a coil disposed on the main surface of the magnetic body and wound in a direction parallel to the main surface can be used. By arranging the coil on the main surface of the magnetic body and winding the coil in a direction parallel to the main surface, a part or the whole of the magnetic body is located on the normal line of the surface where the magnetic flux concentrates and passes through the coil. By arranging them so as to be positioned, a desired inductance can be obtained with a simple shape and a thin shape by utilizing the high magnetic permeability of the magnetic material. For example, a desired inductance can be obtained with a one-turn coil. If a single-turn coil can be used, coil formation becomes extremely simple.

The other end of the inductor is connected to an input or output terminal. When the lumped constant type non-reciprocal circuit device is mounted, a matching capacitor is connected to an input or output terminal to which the inductor is connected. This matching capacitor is connected to match the impedance between the lumped-constant type nonreciprocal circuit element and the mounted microwave circuit. In addition, this matching capacitor forms a low-pass filter circuit together with the inductor formed in the lumped-constant type nonreciprocal circuit element and the matching capacitor connected to the other end of the center conductor to obtain high attenuation of harmonics. I have.

The matching capacitor connected outside the lumped-constant type nonreciprocal circuit device may be formed inside the lumped-constant type nonreciprocal circuit device. With this internal configuration, the overall size of the device can be further reduced.

[0023]

FIG. 1 is an exploded perspective view of a first embodiment according to the present invention.
Shown in FIG. 2 shows an equivalent circuit diagram of this embodiment.
This embodiment is a lumped constant type isolator. In this embodiment, a resin case 12 is disposed on a lower case 11. The resin case 12 is formed with holes and the like for inserting respective components, and external connection terminals 13 are formed in portions facing the outside.
The other end of the external connection terminal 13 is exposed inside the resin case 12 for component connection. The center conductor 16, the capacitor 14, and the resistor 15 are arranged in the component insertion holes of the resin case 12.

The center conductor 16 has three center conductors 18 folded so as to enclose a magnetic body 17 made of garnet. The central conductors 18 are insulated from each other on one surface of the magnetic body 17 made of garnet with an insulating sheet interposed therebetween, and intersect at a predetermined angle. The central conductor 16 is arranged in a central hole of the resin case 12, and an end of each central conductor 18 is connected to the capacitor 14. Electrodes are formed on the upper and lower surfaces of the capacitor 14, the center conductor is connected to the upper electrode, and the lower electrode is grounded. One center conductor 18a
Are connected to the capacitor 14 and to the resistor 15. This resistor 15 is grounded, and this terminal is terminated. One central conductor 18b is connected to the capacitor 1
4 and simultaneously connected to an external connection terminal. Another center conductor 18c is connected to the capacitor 14 and the inductor 19 is connected to the other center conductor 18c. FIG. 6 is an enlarged plan view of a connection portion of the center conductor 18c. The end of the center conductor 18c is arranged on the capacitor 14 and connected thereto. Further, one end 19a of the inductor 19 is arranged and connected thereto. Then, the other end 1 of the inductor 19
9b is arranged and connected on the electrode portion 13a which is electrically connected to the external connection terminal 13.

Further, the permanent magnet 21 is
And a lumped-constant isolator was constructed by covering the upper case 22. In this embodiment, an inductor 19 is connected to the conventional structure. The inductor 19 is formed of a flexible substrate, and is inserted between the center conductor and the permanent magnet. A lumped-constant isolator with the same size as the conventional one could be constructed.

In this embodiment, a 3.9 mmφ garnet and a 5.5 mmφ permanent magnet are used, and a 7 mm square and a height of 2 mm are used.
mm compact and thin lumped constant type isolator.
An isolator for a band of 5 to 960 MHz (f0: 942.5 MHz) was constructed, and the characteristics shown in Table 1 were obtained.

[0027]

[Table 1]

As shown in Table 1, in the embodiment of the present invention,
Although the insertion loss slightly increases, the attenuation of the second harmonic and the attenuation of the third harmonic of the center frequency (f0) can be greatly improved. The comparative example of Table 1 is a case where the inductor 19 of the example is not connected.

The lumped constant type isolator of this embodiment
As shown in the equivalent circuit diagram in FIG. 2, the input terminal has an inductor 19 connected in series. In the mounting circuit,
A matching capacitor is connected to this input terminal. This matching capacitor may be configured in a lumped constant type non-reciprocal circuit device. FIG. 3 shows an equivalent circuit diagram in this case. A matching capacitor 23 is connected to the input end of the inductor 19, and the other end is grounded. As shown in FIG. 3, capacitors 14 and 23 are connected to both ends of the inductor 19, and the capacitors 14 and 23 are grounded to form a low-pass filter circuit. In this case, the capacitor 14
Has the functions of both a capacitor as a capacitor constituting a lumped constant circuit and a capacitor for a low-pass filter.

FIG. 4 is an exploded perspective view of a second embodiment according to the present invention. This embodiment has substantially the same structure as the embodiment shown in FIG. 1. A chip inductor 24 is used as an inductor instead of a flexible substrate, and the end of the center conductor 18c is connected to the capacitor 14. Connected to. This center conductor 18c
FIG. 7 shows an enlarged plan view of the connection portion of FIG. Center conductor 18c
Are disposed on and connected to the capacitor 14.
Further, a chip inductor 24 is arranged and connected between the end portion and the electrode portion 13a which is electrically connected to the external connection terminal 13.

FIG. 5 is an exploded perspective view of a third embodiment according to the present invention. This embodiment has almost the same structure as the embodiment shown in FIG. 1, and uses a one-turn copper wire 25 as an inductor instead of a flexible substrate.

According to the embodiment of the present invention, it is possible to suppress harmonics such as a second harmonic and a third harmonic by simply connecting an inductor in series with the input terminal or further connecting a matching capacitor. Thus, a component such as a low-pass filter which has been conventionally added as a separate component can be eliminated, so that the lumped-constant type nonreciprocal circuit element can be improved in function and the microwave device can be reduced in size. Further, the inductor of the present invention can employ various configurations.
In the above embodiment, the inductor or the like is connected to the input end, but may be connected to the output end. Further, in the above embodiment, the description has been made of the isolator, but the same applies to the circulator.

[0033]

According to the present invention, in a lumped-constant type nonreciprocal circuit device, by connecting an inductor of a center conductor on an input side or an output side in series or further connecting a matching capacitor, harmonics can be reduced. A lumped constant type non-reciprocal circuit device capable of obtaining high attenuation can be obtained. Since the function of obtaining high attenuation of harmonics is added to the lumped-constant type nonreciprocal circuit element, which is one package, what previously required two parts can be achieved with one part. Also, the lumped constant type nonreciprocal circuit element can be achieved with the same size as the conventional one and with a simple structure, which is extremely useful for reducing the size and cost of the device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment according to the present invention.

FIG. 2 is an equivalent circuit diagram of the first embodiment according to the present invention.

FIG. 3 is an equivalent circuit diagram of another embodiment according to the present invention.

FIG. 4 is an exploded perspective view of a second embodiment according to the present invention.

FIG. 5 is an exploded perspective view of a third embodiment according to the present invention.

FIG. 6 is a partially enlarged plan view of the first embodiment according to the present invention.

FIG. 7 is a partially enlarged plan view of a second embodiment according to the present invention.

FIG. 8 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 Reference Signs List 11 lower case 12 resin case 13 external connection terminal 14 capacitor 15 resistor 16 center conductor 17 garnet (magnetic material) 18 center conductor 19 inductor (flexible substrate) 20 resin mold 21 permanent magnet 22 upper case 23 capacitor 24 chip inductor 25 copper wire coil

Claims (10)

[Claims] 1. A basic structure comprising a plurality of central conductors superposed at a predetermined angle in an insulated state, a magnetic body disposed in close contact with the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped-constant type nonreciprocal circuit device housed in the yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. An inductor is connected in series to the other end of the center conductor of
A lumped-constant type non-reciprocal circuit device, comprising a coil disposed on a main surface of the magnetic body and wound in a direction parallel to the main surface. 2. A basic structure comprising a plurality of central conductors stacked at a predetermined angle in an insulated state from each other, a magnetic body arranged closely to the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped-constant type nonreciprocal circuit device housed in the yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. A lumped-constant type non-reciprocal circuit device, characterized in that an inductor formed on a flexible substrate is connected in series to the other end of the center conductor to obtain high attenuation of harmonics. 3. The lumped constant type non-reciprocal circuit device according to claim 2, wherein the inductor is a coil of about one turn formed on a flexible substrate. 4. The lumped-constant type nonreciprocal circuit device according to claim 2, wherein a second matching capacitor whose one end is grounded is connected to the input or output terminal side of the inductor. 5. A basic structure comprising a plurality of central conductors superposed at a predetermined angle in an insulated state, a magnetic body disposed in close contact with the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped-constant type nonreciprocal circuit device housed in the yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. A lumped constant type non-reciprocal circuit device, characterized in that a chip inductor is connected in series to the other end of the center conductor to obtain high attenuation of harmonics. 6. The lumped constant type nonreciprocal circuit device according to claim 5, wherein a second matching capacitor whose one end is grounded is connected to the input or output terminal side of the chip inductor. 7. A basic structure comprising a plurality of central conductors superposed at a predetermined angle in an insulated state, a magnetic body disposed closely to the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In the lumped-constant type nonreciprocal circuit device housed in the yoke, each of the center conductors is connected to a matching capacitor having one end grounded and the other end grounded. A lumped-constant type nonreciprocal circuit device, characterized in that an approximately one-turn inductor is connected in series to the other end of the center conductor to obtain high attenuation of harmonics. 8. A basic structure comprising a plurality of central conductors stacked at a predetermined angle in an insulated state from each other, a magnetic body disposed closely to the central conductor, and a permanent magnet for applying a DC magnetic field to the magnetic body. In a lumped-constant type nonreciprocal circuit device housed in a yoke, each of the center conductors is connected to a first matching capacitor having one end grounded and the other end grounded, and further includes an input side. Alternatively, an inductor is connected in series to the other end of the center conductor on the output side, and a second matching capacitor whose other end is grounded is connected to the inductor,
A lumped constant type non-reciprocal circuit device characterized by being able to obtain high attenuation of harmonics. 9. The lumped-constant type nonreciprocal circuit device according to claim 8, wherein a low-pass filter is constituted by the first matching capacitor, the inductor and the second matching capacitor. 10. The capacitor according to claim 9, wherein the first matching capacitor has both functions of a lumped constant type nonreciprocal circuit capacitor and a low-pass filter capacitor. Lumped constant type non-reciprocal circuit device.